/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#define FIFO_SIZE 2560 // 256*10
typedef struct{
  uint8_t buffer[FIFO_SIZE];
  uint16_t write;
  uint16_t read;  
}FIFO;
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
uint8_t rx_buffer[256];//���ջ���
FIFO fifo;//FIFO buffer
uint8_t write_flag = 0; 
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void FIFO_Init(FIFO *fifo);
uint8_t FIFO_Write(FIFO *fifo, uint8_t *data);
uint8_t FIFO_Read(FIFO *fifo, uint8_t *data);
  uint16_t  temp_buffer[128] = {0};
uint8_t write_bufer[128] = {0};

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_USART1_UART_Init();
  MX_USART2_UART_Init();
  /* USER CODE BEGIN 2 */
  HAL_UART_Receive_DMA(&huart2,rx_buffer,256);
  FIFO_Init(&fifo);//initialize the FIFO buffer
  uint8_t send_buffer[130] = {0};

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  if(write_flag == 1)
	  {

        for(int i = 0; i < 127; i++)
        {
          if(rx_buffer[2*i] < 0x0F)
          {
            temp_buffer[i] = rx_buffer[2*i]*256 + rx_buffer[2*i+1];
          }
          else if(rx_buffer[2*i+1]< 0x0F && (2*i+2 < 256))
          {
            temp_buffer[i] = rx_buffer[2*i+1]*256 + rx_buffer[2*i+2];
          }
        }
        for(int i = 0; i < 128; i++)
        {   
          int16_t result = (temp_buffer[i] -2104);
          if ((result < 0) && (result > -50)) {
            result = 0;
        } else if (result > 255) {
            result = 255;
        } else if (result < -50)
        {
            result = 0x7F;//修正偏移量
        }
        write_bufer[i] = (uint8_t)result;
        }
        FIFO_Write(&fifo, write_bufer);//write the data to the buffer
        write_flag = 0;
        
        // for(int i = 0; i < 127; i++)
        // {
        //     temp_buffer[i] = rx_buffer[2*i]*256 + rx_buffer[2*i+1];
        // }
        // for(int i = 0; i < 128; i++)
        // {   
        //   int16_t result = (temp_buffer[i] -2048);
        //   if ((result < 0) && (result > -50)) {
        //     result = 0;
        // } else if (result > 255) {
        //     result = 255;
        // } else if (result < -50)
        // {
        //     result = 0x20;
        // }
        // write_bufer[i] = (uint8_t)result;
        // }
        // FIFO_Write(&fifo, write_bufer);//write the data to the buffer
        // write_flag = 0;
      
      
	  }
	  if(FIFO_Read(&fifo,send_buffer))
	  {
	    HAL_UART_Transmit_DMA(&huart1,send_buffer,128);
	  }
    HAL_UART_Receive_DMA(&huart2,rx_buffer,256);
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */
/*FIFO function */
void FIFO_Init(FIFO *fifo)
{
  fifo->read = 0;
  fifo->write = 0;
}
uint8_t FIFO_Write(FIFO *fifo, uint8_t *data) //  write in 256 byte at once
{

  for(int i = 0; i < 128; i++)
  {
	    if((fifo->write + 1) >= FIFO_SIZE)
        {
          fifo->write = 0;//circular buffer, if the write pointer is at the end, then move to the beginning
        }
    fifo->buffer[fifo->write] = data[i];
    fifo->write++;//suceessful write
  }
  return 1;
}
uint8_t FIFO_Read(FIFO *fifo, uint8_t *data)
{
	for( int i = 0; i<128;i++){
	    if((fifo->read + 1) == FIFO_SIZE)
        {
        fifo->read = 0;//circular buffer, if the read pointer is at the end, then move to the beginning
        }
        if(fifo->read == fifo->write)
        {
         return 0;//represent the buffer is empty
        }
        data[i] = fifo->buffer[fifo->read];
		
   		fifo->read++;
	}
  return 1;//represent susscessful read
}


void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  if(huart->Instance == USART2)
  {
    write_flag = 1;
    
  }
//HAL_UART_Receive_IT(&huart1, rx_buffer, 256);
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
